:root{--tessera-primary:#2563eb;--tessera-primary-light:#dbeafe;--tessera-primary-dark:#1e40af;--tessera-text:#1f2937;--tessera-text-light:#6b7280;--tessera-bg:#fff;--tessera-bg-secondary:#f9fafb;--tessera-border:#e5e7eb;--tessera-success:#16a34a;--tessera-success-bg:color-mix(in srgb, var(--tessera-success) 8%, transparent);--tessera-success-border:color-mix(in srgb, var(--tessera-success) 25%, transparent);--tessera-error:#dc2626;--tessera-error-bg:color-mix(in srgb, var(--tessera-error) 8%, transparent);--tessera-error-border:color-mix(in srgb, var(--tessera-error) 25%, transparent);--tessera-warning:#d97706;--tessera-font-family:"Inter", system-ui, sans-serif;--tessera-font-size-base:1rem;--tessera-line-height:1.6;--tessera-spacing-sm:.5rem;--tessera-spacing-md:1rem;--tessera-spacing-lg:1.5rem;--tessera-spacing-xl:2rem;--tessera-sidebar-width:280px;--tessera-content-max-width:800px;--tessera-focus-ring:0 0 0 3px #2563eb66;--tessera-transition-fast:.15s ease;--tessera-transition-normal:.25s ease}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.15}body{font-family:var(--tessera-font-family);font-size:var(--tessera-font-size-base);line-height:var(--tessera-line-height);color:var(--tessera-text);background-color:var(--tessera-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}button,input,select,textarea{font-family:inherit;font-size:inherit;line-height:inherit;color:inherit}img,svg,video,canvas,audio,iframe,embed,object{max-width:100%;display:block}h1,h2,h3,h4,h5,h6{color:var(--tessera-text);margin-top:var(--tessera-spacing-xl);margin-bottom:var(--tessera-spacing-md);font-weight:700;line-height:1.25}h1{font-size:2rem}h2{font-size:1.625rem}h3{font-size:1.375rem}h4{font-size:1.125rem}h5{font-size:1rem}h6{font-size:.875rem}h1:first-child,h2:first-child,h3:first-child{margin-top:0}p{margin-bottom:var(--tessera-spacing-md)}a{color:var(--tessera-primary);text-underline-offset:2px;transition:color 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0;border:none;padding:0;font-size:.875rem}blockquote{margin-bottom:var(--tessera-spacing-md);padding:var(--tessera-spacing-md) var(--tessera-spacing-lg);border-left:4px solid var(--tessera-primary);background-color:var(--tessera-bg-secondary);color:var(--tessera-text-light);border-radius:0 8px 8px 0;font-style:italic}blockquote p:last-child{margin-bottom:0}hr{border:none;border-top:1px solid var(--tessera-border);margin:var(--tessera-spacing-xl) 0}table{border-collapse:collapse;width:100%;margin-bottom:var(--tessera-spacing-md);font-size:.9375rem}th,td{padding:var(--tessera-spacing-sm) var(--tessera-spacing-md);border:1px solid var(--tessera-border);text-align:left}th{background-color:var(--tessera-bg-secondary);font-weight:600}:focus-visible{box-shadow:var(--tessera-focus-ring);outline:none}::selection{background-color:var(--tessera-primary-light);color:var(--tessera-text)}.tessera-app{grid-template-columns:var(--tessera-sidebar-width) 1fr;grid-template-rows:1fr auto;min-height:100dvh;display:grid}.tessera-sidebar{background-color:var(--tessera-bg-secondary);border-right:1px solid var(--tessera-border);flex-direction:column;grid-row:1/-1;height:100dvh;display:flex;position:sticky;top:0;overflow-y:auto}.tessera-sidebar-header{padding:var(--tessera-spacing-lg);border-bottom:1px solid var(--tessera-border);flex-shrink:0}.tessera-sidebar-logo{width:auto;max-height:48px;margin-bottom:var(--tessera-spacing-sm)}.tessera-sidebar-title{color:var(--tessera-text);margin:0;font-size:1rem;font-weight:700}.tessera-sidebar-nav{padding:var(--tessera-spacing-md) 0;flex:1;overflow-y:auto}.tessera-nav-section{margin-bottom:var(--tessera-spacing-sm)}.tessera-nav-section-title{width:100%;padding:var(--tessera-spacing-sm) var(--tessera-spacing-lg);text-transform:uppercase;letter-spacing:.05em;color:var(--tessera-text-light);cursor:pointer;transition:color var(--tessera-transition-fast);background:0 0;border:none;justify-content:space-between;align-items:center;font-size:.75rem;font-weight:600;display:flex}.tessera-nav-section-title:hover{color:var(--tessera-text)}.tessera-nav-section-chevron{width:16px;height:16px;transition:transform var(--tessera-transition-fast)}.tessera-nav-section-chevron.collapsed{transform:rotate(-90deg)}.tessera-nav-lesson-title{padding:var(--tessera-spacing-sm) var(--tessera-spacing-lg);padding-left:calc(var(--tessera-spacing-lg) + var(--tessera-spacing-sm));color:var(--tessera-text);font-size:.8125rem;font-weight:600}.tessera-nav-page{width:100%;padding:6px var(--tessera-spacing-lg);padding-left:calc(var(--tessera-spacing-lg) + var(--tessera-spacing-xl));color:var(--tessera-text-light);cursor:pointer;text-align:left;transition:background-color var(--tessera-transition-fast), color var(--tessera-transition-fast);background:0 0;border:none;border-left:3px solid #0000;font-size:.875rem;text-decoration:none;display:block}.tessera-nav-page:hover{background-color:var(--tessera-border);color:var(--tessera-text)}.tessera-nav-page[aria-current=page]{background-color:var(--tessera-primary-light);color:var(--tessera-primary-dark);border-left-color:var(--tessera-primary);font-weight:600}.tessera-nav-page[aria-disabled=true]{opacity:.45;cursor:not-allowed}.tessera-nav-page[aria-disabled=true]:hover{color:var(--tessera-text-light);background-color:#0000}.tessera-nav-lock-icon{vertical-align:-1px;opacity:.6;margin-right:4px;display:inline-block}.tessera-main{flex-direction:column;min-height:0;display:flex}.tessera-content{width:100%;max-width:var(--tessera-content-max-width);padding:var(--tessera-spacing-xl) var(--tessera-spacing-lg);flex:1;margin:0 auto}.tessera-page-nav{max-width:var(--tessera-content-max-width);padding:var(--tessera-spacing-md) var(--tessera-spacing-lg);border-top:1px solid var(--tessera-border);justify-content:space-between;align-items:center;margin:0 auto;display:flex}.tessera-page-nav-btn{align-items:center;gap:var(--tessera-spacing-sm);padding:var(--tessera-spacing-sm) var(--tessera-spacing-md);color:var(--tessera-primary);border:1px solid var(--tessera-primary);cursor:pointer;transition:background-color var(--tessera-transition-fast), color var(--tessera-transition-fast);background:0 0;border-radius:6px;font-size:.875rem;font-weight:600;display:inline-flex}.tessera-page-nav-btn:hover:not(:disabled){background-color:var(--tessera-primary);color:#fff}.tessera-page-nav-btn:disabled{opacity:.35;cursor:not-allowed}.tessera-page-nav-btn:focus-visible{box-shadow:var(--tessera-focus-ring)}.tessera-progress{background-color:var(--tessera-bg);border-top:1px solid var(--tessera-border);padding:var(--tessera-spacing-sm) var(--tessera-spacing-lg);position:sticky;bottom:0}.tessera-progress-track{background-color:var(--tessera-border);border-radius:2px;width:100%;height:4px;overflow:hidden}.tessera-progress-fill{background-color:var(--tessera-primary);height:100%;transition:width var(--tessera-transition-normal);border-radius:2px}.tessera-progress-label{color:var(--tessera-text-light);text-align:right;margin-top:4px;font-size:.75rem}.tessera-hamburger{top:var(--tessera-spacing-md);left:var(--tessera-spacing-md);z-index:1001;background-color:var(--tessera-bg);border:1px solid var(--tessera-border);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;width:44px;height:44px;padding:0;display:none;position:fixed;box-shadow:0 1px 3px #0000001a}.tessera-hamburger-line{background-color:var(--tessera-text);width:20px;height:2px;transition:transform var(--tessera-transition-fast), opacity var(--tessera-transition-fast);border-radius:1px;display:block}.tessera-hamburger-lines{flex-direction:column;gap:5px;display:flex}.tessera-hamburger[aria-expanded=true] .tessera-hamburger-lines .tessera-hamburger-line:first-child{transform:translateY(7px)rotate(45deg)}.tessera-hamburger[aria-expanded=true] .tessera-hamburger-lines .tessera-hamburger-line:nth-child(2){opacity:0}.tessera-hamburger[aria-expanded=true] .tessera-hamburger-lines .tessera-hamburger-line:nth-child(3){transform:translateY(-7px)rotate(-45deg)}.tessera-sidebar-overlay{z-index:999;background-color:#0006;display:none;position:fixed;inset:0}.tessera-loading-bar{z-index:2000;pointer-events:none;background-color:#0000;height:2px;position:fixed;top:0;left:0;right:0}.tessera-loading-bar-fill{background-color:var(--tessera-primary);width:0;height:100%;box-shadow:0 0 8px var(--tessera-primary);transition:width 12s cubic-bezier(.1,.7,.1,1)}.tessera-loading-bar.appear .tessera-loading-bar-fill{width:90%}.tessera-loading-bar.complete .tessera-loading-bar-fill{width:100%;transition:width .18s ease-out}.tessera-loading-bar-message{top:var(--tessera-spacing-md);z-index:2000;color:var(--tessera-text-light);background-color:var(--tessera-bg-secondary);border:1px solid var(--tessera-border);border-radius:999px;margin:0;padding:4px 12px;font-size:.8125rem;position:fixed;left:50%;transform:translate(-50%)}.tessera-btn-primary{background-color:var(--tessera-primary);color:#fff;cursor:pointer;min-height:44px;font-family:var(--tessera-font-family);transition:background-color var(--tessera-transition-fast), opacity var(--tessera-transition-fast);border:none;border-radius:6px}.tessera-btn-primary:hover:not(:disabled){background-color:var(--tessera-primary-dark)}.tessera-btn-primary:disabled{opacity:.4;cursor:not-allowed}.tessera-error{text-align:center;padding:var(--tessera-spacing-xl) var(--tessera-spacing-md)}.tessera-error 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.card-name{text-align:center;color:var(--rs-text);font-size:1.05rem;font-weight:600}.card:disabled{cursor:default}.card:disabled.selected,.card:disabled.correct,.card:disabled.incorrect{opacity:1}.card:disabled:not(.correct):not(.incorrect):not(.selected){opacity:.5}.round-feedback{text-align:center;color:var(--rs-text-muted);max-width:48ch;margin:0;font-size:.95rem;animation:.2s ease-out both prompt-in}@keyframes card-deal{0%{opacity:0;transform:translateY(20px)rotate(-4deg)scale(.92)}to{opacity:1;transform:translateY(0)rotate(0)scale(1)}}@keyframes prompt-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes card-correct{0%{transform:scale(1)}40%{transform:scale(1.08)}to{transform:scale(1)}}@keyframes card-incorrect{0%,to{transform:translate(0)}20%,60%{transform:translate(-4px)}40%,80%{transform:translate(4px)}}@media 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